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Electrolysis [print-friendly version]
1. Discuss the similarities and differences between the electrochemical cells and electrolytic cells (electrolysis.)
2 Draw and label electrolytic cells for the electrolysis of the following.
(a) molten magnesium chloride with inert electrodes.
(b) dilute aqueous magnesium chloride with inert electrodes.
(c) dilute aqueous silver nitrate with inert electrodes.
(d) concentrated aqueous solution of sodium chloride using inert electrodes.
(e) dilute sulfuric acid with zinc electrodes.
3. Draw and label a diagram used for the electrolytic refining of impure blister copper.
Corrosion
1. Explain why rusting of iron is an electrochemical process. Draw and label a diagram to illustrate this.
28. Draw a diagram to show the effect of two metals in direct contact in a moist environment.
29. Describe briefly several methods of corrosion protection of iron.
30. Explain the difference between a noble coating of metal (e.g. tin coating on iron in food cans) and coating with a more reactive metal (e.g. galvanising).
30. What is meant by the following terms using labelled diagrams.
(a) sacrificial anode?
(b) cathodic protection using an applied e.m.f.?
31. Explain why Aluminium appears to be more corrosion resistant than iron.
32. Under what conditions does Aluminium become very susceptible to corrosion.
33. What is meant by the term anodising of aluminium?
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